EP 1732799 A4 20071128 - CONTROL VALVE FOR A HYDRAULIC POWER STEERING SYSTEM
Title (en)
CONTROL VALVE FOR A HYDRAULIC POWER STEERING SYSTEM
Title (de)
STEUERVENTIL FÜR EINHYDRAULISCHES SERVOLENKSYSTEM
Title (fr)
SOUPAPE DE COMMANDE POUR SYSTEME DE DIRECTION ASSISTEE HYDRAULIQUE
Publication
Application
Priority
- US 2005009828 W 20050323
- US 81800504 A 20040405
Abstract (en)
[origin: US7231940B2] A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.
IPC 8 full level
B62D 5/083 (2006.01)
CPC (source: EP US)
B62D 5/0837 (2013.01 - EP US); Y10T 137/86638 (2015.04 - EP US); Y10T 137/86654 (2015.04 - EP US); Y10T 137/86662 (2015.04 - EP US)
Citation (search report)
- [XY] DE 3802904 A1 19880811 - NISSAN MOTOR [JP]
- [XY] DE 3744319 A1 19880707 - NISSAN MOTOR [JP]
- [X] DE 3744313 A1 19880707 - NISSAN MOTOR [JP]
- [X] JP S59220458 A 19841211 - TOYODA MACHINE WORKS LTD
- [X] EP 0072731 A2 19830223 - BENDIBERICA SA [ES]
- [X] DE 4119913 A1 19920116 - NISSAN MOTOR [JP]
- [X] EP 0112201 A2 19840627 - BENDIBERICA SA [ES]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2005217739 A1 20051006; US 7152627 B2 20061226; AT E526226 T1 20111015; BR PI0509626 A 20070918; CA 2560190 A1 20051027; CA 2560190 C 20090630; CN 1997541 A 20070711; CN 1997541 B 20110504; EP 1732799 A2 20061220; EP 1732799 A4 20071128; EP 1732799 B1 20110928; JP 2007531667 A 20071108; JP 4648385 B2 20110309; US 2007012172 A1 20070118; US 7231940 B2 20070619; WO 2005100131 A2 20051027; WO 2005100131 A3 20070308
DOCDB simple family (application)
US 81800504 A 20040405; AT 05730012 T 20050323; BR PI0509626 A 20050323; CA 2560190 A 20050323; CN 200580012185 A 20050323; EP 05730012 A 20050323; JP 2007507343 A 20050323; US 2005009828 W 20050323; US 53212206 A 20060915